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/*
* ================================================================================
* Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*
*/
package org.onap.dcae.utils.eelf.logger.api.log;
import org.onap.dcae.utils.eelf.logger.api.noop.NoOpEELFLogger;
import java.lang.reflect.InvocationTargetException;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.ServiceLoader;
import java.util.WeakHashMap;
/**
* EELF Log Factory uses {@link ServiceLoader} to load implementations of {@link EELFLogger} in application
* classpath. If no EELF Logging implementations are found - eelf logging is disabled and {@link NoOpEELFLogger}
* is used.
*
* @author Rajiv Singla
*/
public class EELFLogFactory {
private static final ServiceLoader<EELFLogger> SERVICE_LOADER = ServiceLoader.load(EELFLogger.class);
private static final Map<Class<?>, EELFLogger> LOGGER_CACHE = new WeakHashMap<>(64);
private static List<EELFLogger> loggerImplementations = new LinkedList<>();
static {
for (EELFLogger loggerImplementation : SERVICE_LOADER) {
loggerImplementations.add(loggerImplementation);
}
if (loggerImplementations.isEmpty()) {
System.err.println(
"EELF LOGGING ERROR: Unable to find any EELF Logger Implementations in the classpath.");
System.err.println("=============EELF LOGGING IS DISABLED================");
loggerImplementations.add(NoOpEELFLogger.getInstance());
}
}
private EELFLogFactory() {
// private constructor
}
public static <T> EELFLogger getLogger(Class<T> clazz) {
if (LOGGER_CACHE.get(clazz) != null) {
return LOGGER_CACHE.get(clazz);
}
EELFLogger EELFLogger = null;
try {
EELFLogger = loggerImplementations.get(0).getClass().getConstructor(Class.class)
.newInstance(clazz);
return EELFLogger;
} catch (
InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
throw new IllegalStateException("Error while Creating EELF Logger", e);
}
}
}
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